> (Namjin Chung) wrote:
> > in a single file of single software. However, I couldn't have figured
out
> > how I can add error bars of standard deviation to line chart or bar
chart
> > even after many, many trials.
I think I am replying to Namjin Chung, anyway here's some advice to the
person who was having trouble putting error bars in a line chart.
1- Make a table with the X-values, averages and the standard deviations or
whatever you want to use for error bars. StdDev is easy as it is a built-in
function in Excel. Std Err and 95% confidence intervals are a little more
complex as you must build the function yourself using the Variance,
Count (n) and the t-value corresponding to that n (n-1).
Example table
A B C
1 Date Average StdDev
2 Jan-95 5.6 1.2
3 Mar-95 6.3 1.5
4 May-95 7.2 1.4
5 Jul-95 6.5 1.6
2 - Make an XY, bar or line chart using A1:A5 as X and B1:B5 as Y.
3 - Double click the chart to make it active
4 - Either double click the line itself and go to Y error bars
or choose Insert - Error bars from the menu.
6 - Choose the Custom tick box and in both the fields available for that
option, use the mouse to insert, C1:C5
Good luck,
Helgi Briem, DeCode Genetics Inc.